Which of these animals has not evolved from Sauropsids ?

Options

A. Tuataras
B. Birds
C. Mammals
D. Lizards

Answer

To determine which of the listed animals has not evolved from sauropsids, we can analyze each option provided:

1. **Option 1: Tortoises**
- Tortoises are reptiles. Reptiles, including tortoises, evolved from sauropsids. Therefore, this option is incorrect.

2. **Option 2: Birds**
- Birds are also considered reptiles in a broader classification. They evolved from theropod dinosaurs, which are part of the reptilian lineage that descended from sauropsids. Thus, this option is also incorrect.

3. **Option 3: Mammals**
- Mammals evolved from synapsids, which are a different lineage from sauropsids. Therefore, mammals did not evolve from sauropsids. This option is correct.

4. **Option 4: Lizards**
- Lizards are reptiles and, like tortoises, they evolved from sauropsids. Hence, this option is incorrect.

Based on the analysis, the animal that has not evolved from sauropsids is **Option 3: Mammals**.

### Summary of Steps:
1. Identify the classification of each animal.
2. Determine the evolutionary lineage of each option.
3. Conclude which animal does not belong to the sauropsid lineage.